body{
    margin: 0px;
    font-family: "Microsoft Yahei,Helvetica Neue,Helvetica,PingFang SC,Hiragino Sans GB,SimSun,sans-serif";
}

/*高宽的模式*/
*{
    box-sizing: border-box;
}

/*去掉所有连接的下划线*/
a,
a:hover{
    text-decoration: none;
    color:inherit;
}